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diff --git a/Materials_Science/Chapter15.ipynb b/Materials_Science/Chapter15.ipynb
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-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:7315f4cd0dbe1ea8c121564011c9ce9945618f308024d617157c5ed6076bc7d9"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter15:Composite Materials and Ceramics"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Ex15.1:pg-299"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Example 15.1 : colume ratio of aluminium and boron\n",
-      " \n",
-      "import numpy.linalg as lin\n",
-      "yal=715;# in GN/,**2\n",
-      "yfe=210;# in GN/,**2\n",
-      "yb=440;# in GN/,**2\n",
-      "A=numpy.array([[71, 71],[71, 440]]);#\n",
-      "B=numpy.array([71,210]);#\n",
-      "X=lin.solve(A,B)\n",
-      "print round(X[0],3),\"is volume ratio of aluminium \"\n",
-      "print round(X[1],3),\"is volume ratio of boron \"\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "0.623 is volume ratio of aluminium \n",
-        "0.377 is volume ratio of boron \n"
-       ]
-      }
-     ],
-     "prompt_number": 5
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file